I think that the implication has generally been that the "uchi-deshi" were training with Ueshiba full time daily for whatever period they were there as uchi-deshi.

Best,

Chris

I think though that this has been implied by students rather than explicily stated by their instructors. I many times heard people such as Tamura, Yamada and Chiba say things like "of course OSensei was away a lot" or variations thereof and Chiba sensei has often said that people in general understimated the 2nd Doshus influence on Aikido both technically and in terms of its popularity worldwide.